Round Fluidized Bed Partition Walls for Residence Time Control
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Solution Overview
Problem
Existing fluidized bed apparatuses with rectangular geometry are expensive, space-intensive, and not pressure-resistant, while those with round geometry offer limited process conditions and wide residence time spectra, making it difficult to achieve defined particle structures and multi-stage processes.
Innovation Solution
A device with a round cross-section process space divided into chambers by adjustable weirs that protrude radially, allowing for a horizontally uniform solid flow and adjustable residence time, enabling multi-stage processes with reduced space requirements and improved pressure resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rectangular apparatus geometry is used, then the flow of solids is uniformly directed and residence time spectrum is narrow, but the device requires large space and has high mass making it expensive to produce
Solution Approach 1:
The process space is divided into multiple chambers by partition walls that extend from the inflow plate to the process space wall. This segmentation allows the device to achieve narrow residence time spectrum and uniform solids flow direction (characteristics of rectangular geometry) while using a compact round overall geometry that reduces space requirements and mass.
2Weight of stationary object
If a round apparatus geometry is used, then space requirements are reduced and pressure resistance is improved, but the fluidized bed height increases resulting in wide residence time spectrum
Solution Approach 1:
By dividing the round process space into multiple chambers using partition walls, the effective flow path length is extended without increasing the overall device footprint. This maintains the compact round geometry for reduced mass and space, while achieving narrow residence time spectrum through the segmented chamber structure.
Solution Approach 2:
The partition walls extend radially from the inflow plate toward the process space wall, utilizing the radial dimension of the round geometry to create multiple chambers. This dimensional approach allows extended residence time control path within the compact circular footprint, preventing excessive fluidized bed height while maintaining precise residence time control.
3Weight of stationary object
If a round apparatus geometry is used, then space requirements are reduced, but only one process step can be realized due to limited process condition control
Solution Approach 1:
The process space is divided into multiple chambers by partition walls, with each chamber capable of being equipped with different internals (such as spray nozzles, fluidization elements, or heating elements). This allows different process conditions to be established in different chambers, enabling multi-stage processes such as granulation followed by drying, all within a compact round geometry that reduces device mass.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design allows for precise control of residence time and flow geometry, enabling efficient multi-stage processes with reduced space and manufacturing costs, while maintaining pressure resistance and ease of cleaning and integration with existing systems.
Implementation Method 1
solids are treated in a continuous fluidized bed... brought into contact with the respective fluidization medium in the fluidized bed
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a device for continuously treating solids in a fluidised bed apparatus, comprising a round process chamber with a solids inlet and a solids outlet, and a distributor plate which is adapted to the inner contour of said process chamber and beneath which a media inlet is arranged to produce and maintain the fluidised bed. According to the invention, on said distributor plate (1) there is a separating wall (2) that protrudes radially inwards from the process chamber (3, 9) inner wall (10) and into said process chamber (3, 9). The solids inlet (5) is located on one side close to the separating wall (2), and the solids outlet (6) is on the other side close to the separating wall (2). It is particularly advantageous to arrange, on the distributor plate (1) and along the axis of the process chamber (9), a displacer element (8) that is connected to said separating wall (2). This has the advantage that, in a process chamber that has a round cross-section while the fluidised bed is also flat, an evenly directed flow of solids in the horizontal direction is obtained over a longer distance. Such a device allows a narrow spectrum of residence time.